API Thread Gauges Type of Thread Features of KURODA API Gauges

KURODA’S API (American Petroleum Institute) Thread Gauges

and Premium Connection Gauges have been used worldwide and

receiving the highest quality reputation. KURODA has been

granted the right of use of API Official Monogram for the following

API Thread Gauges since1957;

Specification 5B under the License No. 5B-0015,

Specification 7-2 under the License No. 7-2-0187.

KURODA supplies all kinds of Thread Gauges listed in the API

Spec.5B and 7-2.

KURODA also supplies a Thread Gauge having a special thread

form, or the size of diameter as large as 20 inches (508mm).

To find out more information on our products, please contact us

by e-mailing.

We try to provide the best possible solution for you as quickly as

we can.

[Light-Duty]

• In 1975, ahead of the times, KURODA was successfully made

the gauges of 6 5/8 through 20 inches lighter than before.

[Longer Operating Life]

• Correct treatments such as heat and anti-distort purposes

and select ion of the r ight mater ia ls made the Kuroda

Gauges reputable for its quality and the longer life.

[Easy to use]

• For portable and easy maintenance purposes, the handle is

standard- equipped on all products.

• Notch and Limit Plate are mounted on spec. 5B working ring

gauges except for Ex. Li.Csg to determine the allowance

limit of your products.

• Upon request, a Hook Ring can be mounted on larger

diameter ring gauges for better workability.

[Advanced Technology]

• With the abundant know-how and the technologies, KURODA

can design gauges that are “beyond API specification” for

you. In other words, KURODA can make the products that

meet your requirements and needs, just the way you wish.

[Manufacturing Capabilities]

• Grinding machines such as the ground thread and so forth

are designed and developed by KURODA.

[Higher Quality]

• KURODA Precision Industries Ltd is ISO 17025 approved

f i rm. I t means KURODA is author ized for ca l ibrat ing

instruments such as Gauge Blocks.

And at the same time, KURODA is in possession of many

measuring instruments on its assembly lines. And therefore,

this leads that KURODA is currently offering to you the

products that are reliable and of high quality.

When ordering, please provide more information for the

following:

1. Type of Thread

2. Size of Gauge.

3. Reference master or working gauges.

4. Plug or Ring or both.

5. Right hand or left hand, in case of API Spec. 7-2thread

gauges.

6. Inspection results to be specified either in inches or metric.

API Spec. 5B

API Spec. 7-2 Rotary shouldered connections

LPLine Pipe Thread Gauges

Thread Angle : 60˚

Size T.P.I. Taper1/81/43/81/23/4

1 1 1/41 1/22 2 1/23 3 1/24 5 6 8

10 12

14D 16D 18D 20D

2718181414

11 1/211 1/211 1/211 1/2

8888888888888

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 16

NCNumber Style

Thread Angle : 60˚

Size T.P.I. TaperNC23NC26NC31NC35NC38NC40NC44NC46NC50NC56NC61NC70NC77

4444444444444

1 : 61 : 61 : 61 : 61 : 61 : 61 : 61 : 61 : 61 : 41 : 41 : 41 : 4

CSGCasing Round Thread Gauges

Thread Angle : 60˚

Size T.P.I. Taper4 1/25 5 1/26 5/87 7 5/88 5/89 5/8

10 3/411 3/413 3/816 18 5/820

88888888888888

※※※※※※※※

※

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 16

TBGNon-Upset Tubing Thread Gauges

Thread Angle : 60˚

Size T.P.I. Taper1.0501.3151.6601.9002 3/82 7/83 1/24 4 1/2

1010101010101088

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 16

UP TBGExternal-Upset Tubing Thread Gauges

Thread Angle : 60˚

Size T.P.I. Taper1.0501.3151.6601.9002 3/82 7/83 1/24 4 1/2

1010101088888

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 16

REGRegular Style (Right or left hand)

Thread Angle : 60˚

Size T.P.I. Taper1 1 1/22 3/82 7/83 1/24 1/25 1/26 5/87 5/88 5/8

6655554444

1 : 81 : 81 : 41 : 41 : 41 : 41 : 41 : 61 : 41 : 4

Ex. Li. Csg.Extreme-Line Casing Thread & Seal Gauges

Thread Angle : 6˚×6˚

Size T.P.I. Taper5 5 1/26 5/87 7 5/88 5/89 5/8

10 3/4

66666555

1 : 81 : 81 : 81 : 81 : 8

1 : 9.61 : 9.61 : 9.6

BUTTRESS CSGButtress Casing Thread Gauges

Thread Angle : 3˚×10˚

Size T.P.I. Taper4 1/25 5 1/26 5/87 7 5/88 5/89 5/8

10 3/411 3/413 3/816 18 5/820

55555555555555

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 121 : 121 : 12

FHFull-hole Style

Thread Angle : 60˚

Size T.P.I. Taper3 1/24 4 1/25 1/26 5/8

54544

1 : 41 : 61 : 41 : 61 : 6

IFInternal-flush StyleThread Angle : 60˚

Size T.P.I. Taper2 3/82 7/83 1/24 4 1/25 1/2

444444

1 : 61 : 61 : 61 : 61 : 61 : 6

Note)※：Short and long

Note) Taper of seal=1 : 6

License No.5B License No.7-2

– 1 – – 2 – – 3 –

API Thread Gauges Type of Thread Features of KURODA API Gauges

KURODA’S API (American Petroleum Institute) Thread Gauges

and Premium Connection Gauges have been used worldwide and

receiving the highest quality reputation. KURODA has been

granted the right of use of API Official Monogram for the following

API Thread Gauges since1957;

Specification 5B under the License No. 5B-0015,

Specification 7-2 under the License No. 7-2-0187.

KURODA supplies all kinds of Thread Gauges listed in the API

Spec.5B and 7-2.

KURODA also supplies a Thread Gauge having a special thread

form, or the size of diameter as large as 20 inches (508mm).

To find out more information on our products, please contact us

by e-mailing.

We try to provide the best possible solution for you as quickly as

we can.

[Light-Duty]

• In 1975, ahead of the times, KURODA was successfully made

the gauges of 6 5/8 through 20 inches lighter than before.

[Longer Operating Life]

• Correct treatments such as heat and anti-distort purposes

and select ion of the r ight mater ia ls made the Kuroda

Gauges reputable for its quality and the longer life.

[Easy to use]

• For portable and easy maintenance purposes, the handle is

standard- equipped on all products.

• Notch and Limit Plate are mounted on spec. 5B working ring

gauges except for Ex. Li.Csg to determine the allowance

limit of your products.

• Upon request, a Hook Ring can be mounted on larger

diameter ring gauges for better workability.

[Advanced Technology]

• With the abundant know-how and the technologies, KURODA

can design gauges that are “beyond API specification” for

you. In other words, KURODA can make the products that

meet your requirements and needs, just the way you wish.

[Manufacturing Capabilities]

• Grinding machines such as the ground thread and so forth

are designed and developed by KURODA.

[Higher Quality]

• KURODA Precision Industries Ltd is ISO 17025 approved

f i rm. I t means KURODA is author ized for ca l ibrat ing

instruments such as Gauge Blocks.

And at the same time, KURODA is in possession of many

measuring instruments on its assembly lines. And therefore,

this leads that KURODA is currently offering to you the

products that are reliable and of high quality.

When ordering, please provide more information for the

following:

1. Type of Thread

2. Size of Gauge.

3. Reference master or working gauges.

4. Plug or Ring or both.

5. Right hand or left hand, in case of API Spec. 7-2thread

gauges.

6. Inspection results to be specified either in inches or metric.

API Spec. 5B

API Spec. 7-2 Rotary shouldered connections

LPLine Pipe Thread Gauges

Thread Angle : 60˚

Size T.P.I. Taper1/81/43/81/23/4

1 1 1/41 1/22 2 1/23 3 1/24 5 6 8

10 12

14D 16D 18D 20D

2718181414

11 1/211 1/211 1/211 1/2

8888888888888

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 16

NCNumber Style

Thread Angle : 60˚

Size T.P.I. TaperNC23NC26NC31NC35NC38NC40NC44NC46NC50NC56NC61NC70NC77

4444444444444

1 : 61 : 61 : 61 : 61 : 61 : 61 : 61 : 61 : 61 : 41 : 41 : 41 : 4

CSGCasing Round Thread Gauges

Thread Angle : 60˚

Size T.P.I. Taper4 1/25 5 1/26 5/87 7 5/88 5/89 5/8

10 3/411 3/413 3/816 18 5/820

88888888888888

※※※※※※※※

※

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 16

TBGNon-Upset Tubing Thread Gauges

Thread Angle : 60˚

Size T.P.I. Taper1.0501.3151.6601.9002 3/82 7/83 1/24 4 1/2

1010101010101088

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 16

UP TBGExternal-Upset Tubing Thread Gauges

Thread Angle : 60˚

Size T.P.I. Taper1.0501.3151.6601.9002 3/82 7/83 1/24 4 1/2

1010101088888

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 16

REGRegular Style (Right or left hand)

Thread Angle : 60˚

Size T.P.I. Taper1 1 1/22 3/82 7/83 1/24 1/25 1/26 5/87 5/88 5/8

6655554444

1 : 81 : 81 : 41 : 41 : 41 : 41 : 41 : 61 : 41 : 4

Ex. Li. Csg.Extreme-Line Casing Thread & Seal Gauges

Thread Angle : 6˚×6˚

Size T.P.I. Taper5 5 1/26 5/87 7 5/88 5/89 5/8

10 3/4

66666555

1 : 81 : 81 : 81 : 81 : 8

1 : 9.61 : 9.61 : 9.6

BUTTRESS CSGButtress Casing Thread Gauges

Thread Angle : 3˚×10˚

Size T.P.I. Taper4 1/25 5 1/26 5/87 7 5/88 5/89 5/8

10 3/411 3/413 3/816 18 5/820

55555555555555

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 121 : 121 : 12

FHFull-hole Style

Thread Angle : 60˚

Size T.P.I. Taper3 1/24 4 1/25 1/26 5/8

54544

1 : 41 : 61 : 41 : 61 : 6

IFInternal-flush StyleThread Angle : 60˚

Size T.P.I. Taper2 3/82 7/83 1/24 4 1/25 1/2

444444

1 : 61 : 61 : 61 : 61 : 61 : 6

Note)※：Short and long

Note) Taper of seal=1 : 6

License No.5B License No.7-2

– 1 – – 2 – – 3 –

API Thread Gauges Type of Thread Features of KURODA API Gauges

KURODA’S API (American Petroleum Institute) Thread Gauges

and Premium Connection Gauges have been used worldwide and

receiving the highest quality reputation. KURODA has been

granted the right of use of API Official Monogram for the following

API Thread Gauges since1957;

Specification 5B under the License No. 5B-0015,

Specification 7-2 under the License No. 7-2-0187.

KURODA supplies all kinds of Thread Gauges listed in the API

Spec.5B and 7-2.

KURODA also supplies a Thread Gauge having a special thread

form, or the size of diameter as large as 20 inches (508mm).

To find out more information on our products, please contact us

by e-mailing.

We try to provide the best possible solution for you as quickly as

we can.

[Light-Duty]

• In 1975, ahead of the times, KURODA was successfully made

the gauges of 6 5/8 through 20 inches lighter than before.

[Longer Operating Life]

• Correct treatments such as heat and anti-distort purposes

and select ion of the r ight mater ia ls made the Kuroda

Gauges reputable for its quality and the longer life.

[Easy to use]

• For portable and easy maintenance purposes, the handle is

standard- equipped on all products.

• Notch and Limit Plate are mounted on spec. 5B working ring

gauges except for Ex. Li.Csg to determine the allowance

limit of your products.

• Upon request, a Hook Ring can be mounted on larger

diameter ring gauges for better workability.

[Advanced Technology]

• With the abundant know-how and the technologies, KURODA

can design gauges that are “beyond API specification” for

you. In other words, KURODA can make the products that

meet your requirements and needs, just the way you wish.

[Manufacturing Capabilities]

• Grinding machines such as the ground thread and so forth

are designed and developed by KURODA.

[Higher Quality]

• KURODA Precision Industries Ltd is ISO 17025 approved

f i rm. I t means KURODA is author ized for ca l ibrat ing

instruments such as Gauge Blocks.

And at the same time, KURODA is in possession of many

measuring instruments on its assembly lines. And therefore,

this leads that KURODA is currently offering to you the

products that are reliable and of high quality.

When ordering, please provide more information for the

following:

1. Type of Thread

2. Size of Gauge.

3. Reference master or working gauges.

4. Plug or Ring or both.

5. Right hand or left hand, in case of API Spec. 7-2thread

gauges.

6. Inspection results to be specified either in inches or metric.

API Spec. 5B

API Spec. 7-2 Rotary shouldered connections

LPLine Pipe Thread Gauges

Thread Angle : 60˚

Size T.P.I. Taper1/81/43/81/23/4

1 1 1/41 1/22 2 1/23 3 1/24 5 6 8

10 12

14D 16D 18D 20D

2718181414

11 1/211 1/211 1/211 1/2

8888888888888

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 16

NCNumber Style

Thread Angle : 60˚

Size T.P.I. TaperNC23NC26NC31NC35NC38NC40NC44NC46NC50NC56NC61NC70NC77

4444444444444

1 : 61 : 61 : 61 : 61 : 61 : 61 : 61 : 61 : 61 : 41 : 41 : 41 : 4

CSGCasing Round Thread Gauges

Thread Angle : 60˚

Size T.P.I. Taper4 1/25 5 1/26 5/87 7 5/88 5/89 5/8

10 3/411 3/413 3/816 18 5/820

88888888888888

※※※※※※※※

※

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 16

TBGNon-Upset Tubing Thread Gauges

Thread Angle : 60˚

Size T.P.I. Taper1.0501.3151.6601.9002 3/82 7/83 1/24 4 1/2

1010101010101088

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 16

UP TBGExternal-Upset Tubing Thread Gauges

Thread Angle : 60˚

Size T.P.I. Taper1.0501.3151.6601.9002 3/82 7/83 1/24 4 1/2

1010101088888

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 16

REGRegular Style (Right or left hand)

Thread Angle : 60˚

Size T.P.I. Taper1 1 1/22 3/82 7/83 1/24 1/25 1/26 5/87 5/88 5/8

6655554444

1 : 81 : 81 : 41 : 41 : 41 : 41 : 41 : 61 : 41 : 4

Ex. Li. Csg.Extreme-Line Casing Thread & Seal Gauges

Thread Angle : 6˚×6˚

Size T.P.I. Taper5 5 1/26 5/87 7 5/88 5/89 5/8

10 3/4

66666555

1 : 81 : 81 : 81 : 81 : 8

1 : 9.61 : 9.61 : 9.6

BUTTRESS CSGButtress Casing Thread Gauges

Thread Angle : 3˚×10˚

Size T.P.I. Taper4 1/25 5 1/26 5/87 7 5/88 5/89 5/8

10 3/411 3/413 3/816 18 5/820

55555555555555

1 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 161 : 121 : 121 : 12

FHFull-hole Style

Thread Angle : 60˚

Size T.P.I. Taper3 1/24 4 1/25 1/26 5/8

54544

1 : 41 : 61 : 41 : 61 : 6

IFInternal-flush StyleThread Angle : 60˚

Size T.P.I. Taper2 3/82 7/83 1/24 4 1/25 1/2

444444

1 : 61 : 61 : 61 : 61 : 61 : 6

Note)※：Short and long

Note) Taper of seal=1 : 6

License No.5B License No.7-2

– 1 – – 2 – – 3 –

Since its founding in 1925, KURODA Precision Industries Ltd. has continued to advance with the history of gauges in

our country, and has been striving for improvement in the product quality and reliability.

As a result, KURODA has successfully received the highest class evaluation as a pioneer of gauge manufacturer,

such as an authority to indicate JIS "Grade 1" thread gauge mark for the first time in Japan and a production license

for API gauges first time ever in the East.

The importance of gauges has been recognized anew, because they play a significant role in quality control and

quality assurance and the traceability of measurement has become a necessary condition in the quality management

system represented by ISO 9000 Series in recent years.

KURODA, as an authorized company for length section calibration, believes firmly that it will be of service to the

establishment of traceability of customer’s measurement equipment to the national standard through the calibration

and certification of gauge blocks and other various gauges as well as measurement equipment.

KURODA is capable of making many different types of gauges, 1mm through 500mm for you.

KURODA API gauges are widely used and are receiving great recognition at such places as National Test authorities, Research institutions, Major Pipe manufacturers and etc. Regardless of the market location, whether it is domestic or offshore, KURODA is receiving a high reputation around the globe.

Head Office:239, Shimohirama, Saiwai-ku, Kawasaki, Kanagawa 212-8560, JapanTelephone: 81-44-555-3801 Fax: 81-44-555-1479E-mail: tlg_j@kuroda-precision.co.jp

Distributors:

Printed in Japan 2010. 03 PMC

KURODA also manufactures and sells the gauge blocks.

CAT.NO.PK110-○a

– 4 – – 5 –

JCSS CERTIFICATE

Since its founding in 1925, KURODA Precision Industries Ltd. has continued to advance with the history of gauges in

our country, and has been striving for improvement in the product quality and reliability.

As a result, KURODA has successfully received the highest class evaluation as a pioneer of gauge manufacturer,

such as an authority to indicate JIS "Grade 1" thread gauge mark for the first time in Japan and a production license

for API gauges first time ever in the East.

The importance of gauges has been recognized anew, because they play a significant role in quality control and

quality assurance and the traceability of measurement has become a necessary condition in the quality management

system represented by ISO 9000 Series in recent years.

KURODA, as an authorized company for length section calibration, believes firmly that it will be of service to the

establishment of traceability of customer’s measurement equipment to the national standard through the calibration

and certification of gauge blocks and other various gauges as well as measurement equipment.

KURODA is capable of making many different types of gauges, 1mm through 500mm for you.

KURODA API gauges are widely used and are receiving great recognition at such places as National Test authorities, Research institutions, Major Pipe manufacturers and etc. Regardless of the market location, whether it is domestic or offshore, KURODA is receiving a high reputation around the globe.

Head Office:239, Shimohirama, Saiwai-ku, Kawasaki, Kanagawa 212-8560, JapanTelephone: 81-44-555-3801 Fax: 81-44-555-1479E-mail: tlg_j@kuroda-precision.co.jp

Distributors:

Printed in Japan 2010. 03 PMC

KURODA also manufactures and sells the gauge blocks.

CAT.NO.PK110-○a

– 4 – – 5 –

JCSS CERTIFICATE